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Why is it so hard to answer this question. (Which transistor to select).

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Bud:
Gate impedance and depletion/enhancement mode is not what OP wants. He wants simple answer, so give him one. :box:

Someone:

--- Quote from: Zero999 on October 29, 2023, 06:19:06 pm ---That's true, but note that J-FETs can also be biased into the enhancement region. The gate impedance drops, but it's not an issue, so long as it doesn't load the circuit driving it and the gate current isn't exceeded.
--- End quote ---
At which point we also discuss "reverse active" region of bipolar transistors ?

TimFox:
Besides obvious parameters such as maximum voltage and power dissipation, an important question for choosing a BJT is whether you want high beta or lower beta.
Unfortunately, this otherwise useful discussion neglects that question.
https://wiki.analog.com/university/courses/electronics/text/choosing-transistors

CatalinaWOW:
Perhaps the best way to answer the OPs question would be to translate it into his terms and then look at the answers here in those terms.  Question:  I have a shelf full of motors and engines.  All I'm interested in is fuel economy and small vehicles.  Which engine would be best?

And our answers;

It's not simple.  There are gas and diesel and electric.

No It's worse than that. There are reed valves and overhead cams and hydraulic lifters and two and four valves per cylinder...

vk6zgo:

--- Quote from: Bud on October 29, 2023, 03:08:04 pm ---
--- Quote from: chinoy on October 29, 2023, 11:04:17 am ---. Or the person who has designed the amplifier has given me a list of transistors that can be used.
How do I select the best one.

--- End quote ---
Just pick one from his list. You will not get drastic difference from using either of them.
Most often performance of a circuit is a result of the design topology, not particular transistor.

--- End quote ---

Yes, at one point, the essence of circuit design was to reduce the reliance upon device characteristics to a minimum.
Today, not so much.

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